WO2014061431A2 - 空気調和機 - Google Patents

空気調和機 Download PDF

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Publication number
WO2014061431A2
WO2014061431A2 PCT/JP2013/076465 JP2013076465W WO2014061431A2 WO 2014061431 A2 WO2014061431 A2 WO 2014061431A2 JP 2013076465 W JP2013076465 W JP 2013076465W WO 2014061431 A2 WO2014061431 A2 WO 2014061431A2
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WO
WIPO (PCT)
Prior art keywords
temperature
indoor
air
refrigerant
detection device
Prior art date
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PCT/JP2013/076465
Other languages
English (en)
French (fr)
Japanese (ja)
Other versions
WO2014061431A3 (ja
Inventor
敦彦 横関
進 中山
宏明 坪江
Original Assignee
日立アプライアンス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 日立アプライアンス株式会社 filed Critical 日立アプライアンス株式会社
Priority to CN201380044081.9A priority Critical patent/CN104583684B/zh
Priority to US14/422,224 priority patent/US10234147B2/en
Priority to IN940DEN2015 priority patent/IN2015DN00940A/en
Publication of WO2014061431A2 publication Critical patent/WO2014061431A2/ja
Publication of WO2014061431A3 publication Critical patent/WO2014061431A3/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/10—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with separate supply lines and common return line for hot and cold heat-exchange fluids i.e. so-called "3-conduit" system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/12—Inflammable refrigerants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

Definitions

  • the present invention relates to a multi-room air conditioner including a plurality of indoor units, and is particularly suitable for an air conditioner using R32 as a refrigerant.
  • Patent Document 1 As a multi-room type air conditioner including a plurality of indoor units, for example, there is one described in JP-A-2-133760 (Patent Document 1). The thing of this patent document 1 describes controlling the cooling capacity of each of the plurality of indoor units by the refrigerant superheat degree at the heat exchanger outlet in each indoor unit during the cooling operation of the multi-room air conditioner. Yes.
  • Patent Document 2 There is also Japanese Patent No. 3956589 (Patent Document 2).
  • R32 which is a refrigerant
  • GWP global warming potential
  • Patent Document 1 during cooling operation in a conventional multi-room air conditioner having a plurality of indoor units, the degree of refrigerant superheat at the outlet of the heat exchanger in each indoor unit is controlled to flow to each indoor unit.
  • the cooling capacity of each indoor unit is controlled by adjusting the refrigerant flow rate.
  • the refrigerant at the outlet of the heat exchanger in the indoor unit cannot contain liquid refrigerant. Therefore, when a refrigerant such as R32 is used, the compressor discharge temperature is abnormal. However, there is a problem that reliability rises.
  • the refrigerant temperature at the compressor outlet is 10 to 15 ° C. higher than that of R410A, which is a conventionally used refrigerant. For this reason, the refrigerant draft on the inlet side of the compressor is controlled to be smaller than when R410A is used. In order to reduce the refrigerant draft on the compressor inlet side, heat exchange in the indoor unit is performed.
  • the refrigerant at the outlet of the vessel must contain a liquid refrigerant with a refrigerant superheat degree of zero.
  • the refrigerant at the outlet of the heat exchanger in the indoor unit includes liquid refrigerant
  • the refrigerant superheat control as described in Patent Document 1 cannot be performed.
  • the cooling capacity can be controlled by controlling the evaporation temperature, that is, controlling the suction pressure of the compressor. It becomes difficult to individually control the cooling capacity of each indoor unit in the conditioner.
  • An object of the present invention is to obtain an air conditioner that can suppress an increase in compressor discharge temperature and can individually control the cooling capacity of each of a plurality of indoor units.
  • the present invention connects an outdoor unit equipped with an outdoor heat exchanger and a plurality of indoor units equipped with an indoor heat exchanger and an indoor expansion mechanism using liquid piping and gas piping.
  • the multi-room type air conditioner constituting the refrigeration cycle as the refrigerant circulating in the refrigeration cycle, R32 or a mixed refrigerant containing R32 or more of R32 is used, and each room of each indoor unit is used.
  • a temperature difference detection device that detects an air temperature difference between the suction side air and the discharge side air in the heat exchanger, and based on the air temperature difference in each indoor unit detected by the temperature difference detection device, The cooling capacity of each indoor unit is controlled by adjusting the indoor expansion mechanism.
  • an air conditioner that can suppress an increase in compressor discharge temperature and can individually control the cooling capacity of each of a plurality of indoor units.
  • FIG. 1 illustrates a first embodiment of the air conditioner of the present invention.
  • FIG. 1 is a refrigeration cycle configuration diagram showing the first embodiment.
  • the air conditioner of the present embodiment has a refrigeration cycle as a multi-room type air conditioner in which a plurality of indoor units 200 and 300 are connected to a single outdoor unit 100.
  • coolant containing 70 mass% or more of R32 or R32 is used in a present Example.
  • the outdoor unit 100 includes an outdoor heat exchanger 101, an outdoor fan 102, an outdoor expansion valve 103, a compressor 104, an accumulator 105, an oil separator 106, an oil return capillary 107, a four-way valve 108, and the like.
  • the indoor units 200 and 300 include indoor heat exchangers 201 and 301, indoor fans 202 and 302, indoor expansion valves (indoor expansion mechanisms) 203 and 303, each of which has an adjustable opening degree, and includes electronic expansion valves. It consists of air temperature sensors 206 and 306, blown air temperature sensors 207 and 307, and the like.
  • the refrigerant flows as indicated by solid arrows. That is, the high-temperature and high-pressure gas refrigerant discharged from the compressor 104 is separated from the refrigeration oil by the oil separator 106, and the high-temperature gas refrigerant is sent to the outdoor heat exchanger 101 through the four-way valve 108.
  • the refrigerating machine oil separated by the oil separator 106 is sent to the accumulator 105 through the oil return capillary 107.
  • the high-temperature and high-pressure gas refrigerant that has entered the outdoor heat exchanger 101 is condensed in this outdoor heat exchanger 101 by exchanging heat with outdoor air blown by the outdoor fan 102, and becomes liquid refrigerant.
  • the liquid refrigerant then passes through the outdoor expansion valve 103 (fully opened during cooling operation), flows through the liquid pipe 121, and is sent to the indoor units 200 and 300.
  • the refrigerant sent to the indoor unit 200 is decompressed by the indoor expansion valve 203 and enters the indoor heat exchanger 201.
  • the indoor heat exchanger 201 the refrigerant exchanges heat with the indoor air sent by the indoor fan 202 and evaporates to become a gas refrigerant. At this time, cool air is blown into the room from the indoor unit 200 to cool the room.
  • the refrigerant sent to the indoor unit 300 also changes in the same manner as the indoor unit 200.
  • the gas refrigerant that has exited the indoor units 200 and 300 is sent to the outdoor unit 100 through the gas pipe 122.
  • the gas refrigerant that has returned to the outdoor unit 100 enters the accumulator 105 through the four-way valve 108.
  • the gas refrigerant that has entered the accumulator 105 is sucked from the accumulator 105 into the compressor 104 and compressed together with the refrigerating machine oil returned from the oil separator 106. Thereafter, the same operation is repeated.
  • the refrigerant flows as indicated by the dotted arrows. That is, the high-temperature and high-pressure gas refrigerant discharged from the compressor 104 is separated from the refrigeration oil by the oil separator 106, and the high-temperature gas refrigerant from which the refrigeration oil is separated passes through the four-way valve 108 and the gas pipe 122. Sent to.
  • the refrigerating machine oil separated by the oil separator 106 is sent to the accumulator 105 through the oil return capillary 107.
  • the high-temperature and high-pressure gas refrigerant that has entered the gas pipe 122 is sent to the indoor units 200 and 300.
  • the high-temperature and high-pressure gas refrigerant that has entered the indoor unit 200 exchanges heat with the indoor air blown by the indoor fan 202 in the indoor heat exchanger 201 and condenses to become liquid refrigerant.
  • Indoor heating is performed by heat exchange between the high-temperature refrigerant and room air in the indoor heat exchanger 201.
  • the liquid refrigerant condensed in the indoor heat exchanger 201 flows out of the indoor unit 200 after passing through the indoor expansion valve 203.
  • the refrigerant sent to the indoor unit 300 also changes in the same manner as the indoor unit 200.
  • the liquid refrigerant that has exited the indoor units 200 and 300 is then sent to the outdoor unit 100 through the liquid pipe 121.
  • the liquid refrigerant returned to the outdoor unit 100 is depressurized by the outdoor expansion valve 103, then flows into the outdoor heat exchanger 101, evaporates by exchanging heat with the outdoor air blown by the outdoor fan 102, and gas. Become a refrigerant.
  • This gas refrigerant enters the accumulator 105 through the four-way valve 108.
  • the gas refrigerant that has entered the accumulator 105 is sucked from the accumulator 105 into the compressor 104 and compressed together with the refrigerating machine oil returned from the oil separator 106. Thereafter, the same operation is repeated.
  • the temperature of the intake air (room air) in each of the indoor units 200 and 300 is detected by the intake air temperature sensors 206 and 306.
  • the temperature of the blown air heat exchanged by the indoor heat exchangers 201 and 301 is detected by the blown air temperature sensors 207 and 307.
  • the difference between the intake air temperature and the blown air temperature of the indoor units 200 and 300 during the cooling operation (hereinafter referred to as the intake and blown air temperature difference) is the intake air temperature sensors 206 and 306 and the blown air temperature sensor 207 and the like. It can be determined by the difference from 307.
  • This intake / air temperature difference is determined by a calculation unit (not shown) of the temperature difference detection device, and the calculation unit of the temperature difference detection device is provided in a control device (not shown).
  • the temperature difference detection device includes the intake air temperature sensors 206 and 306, the blown air temperature sensors 207 and 307, and the calculation unit.
  • the cooling capacity in each indoor unit 200, 300 can be estimated from the difference in the temperature of the intake and outlet air in each indoor unit 200, 300 during the cooling operation obtained by this temperature difference detection device. In other words, it can be obtained by multiplying the difference in temperature of the intake and blown air by the air volume of the indoor fans 202 and 302, respectively.
  • the cooling capacity control of each of the indoor units 200 and 300 is performed by detecting the difference in temperature of the intake and outlet air and controlling the indoor expansion valves 203 and 303 so that the difference in temperature of the intake and outlet air becomes a target value.
  • Can do That is, when the cooling capacity is increased, the target value of the intake / outlet air temperature difference is set to be large, and the openings of the indoor expansion valves 203 and 303 are increased so as to approach this target value.
  • the cooling capacity is decreased, the target value of the intake / outlet air temperature difference is set to be small, and the openings of the indoor expansion valves 203 and 303 are made small so as to approach the target value.
  • the cooling capacity is not controlled by the degree of refrigerant superheat, the refrigerant at the outlet of the heat exchanger in the indoor unit can include liquid refrigerant, and therefore the compressor discharge An increase in temperature can be suppressed.
  • the cooling capacity is not controlled by evaporation temperature control (suction pressure control)
  • the air conditioner capable of individually controlling the cooling capacity of each of a plurality of indoor units in a multi-room air conditioner. Can be obtained.
  • the indoor expansion mechanism is configured with an electronic expansion valve or the like. It is not restricted to the said indoor expansion valve made. That is, it may be an indoor expansion mechanism in which a plurality of expansion mechanisms composed of on-off valves and capillary tubes are arranged in parallel and the flow rate is adjusted by selectively opening and closing the on-off valves.
  • FIG. 2 is a configuration diagram of the refrigeration cycle showing the second embodiment
  • FIG. 3 is a diagram for explaining the operation of the indoor expansion valve control during the cooling operation in the second embodiment.
  • FIG. 2 since the part which attached
  • the outdoor unit 100 has substantially the same configuration as that described in FIG. 1, but in the second embodiment, the discharge temperature detection device 111 that detects the discharge temperature of the refrigerant discharged from the compressor 104 includes the compression unit It is provided in the vicinity of the outlet of the machine 104 (in this embodiment, the refrigerant pipe connecting the compressor 104 and the oil separator 106).
  • the indoor units 200 and 300 have basically the same configuration as that described with reference to FIG. 1, but in the second embodiment, the intake air temperature sensors 206 and 306 and the blown air temperature sensor described with reference to FIG.
  • the temperature of the refrigerant flowing into the indoor heat exchangers 201 and 301 (that is, the refrigerant temperature between the outlet side of the indoor expansion valves 203 and 303 and the inlet side of the indoor heat exchangers 201 and 301) is detected.
  • Refrigerant liquid side temperature sensors 204 and 304 and refrigerant gas side temperature sensors 205 and 305 for detecting the temperature of the refrigerant flowing out of the indoor heat exchangers 201 and 301 are provided.
  • the discharge temperature detecting device 111, the refrigerant liquid side temperature sensors 204 and 304, and the refrigerant gas side temperature sensors 205 and 305 may directly detect the temperature of the refrigerant, respectively. It is detected indirectly by measuring temperature.
  • the difference between the intake air temperature and the blown air temperature in each of the indoor units 200 and 300 during the cooling operation is calculated by the calculation unit (not shown) of the temperature difference detection device. It can be obtained as a difference between the suction side air temperature detected by the temperature sensors 206 and 306 and the blowout side air temperature detected by the blowout air temperature sensors 207 and 307. Further, from the difference between the refrigerant liquid side temperature detected by the refrigerant liquid side temperature sensors 204 and 304 and the refrigerant gas side temperature detected by the refrigerant gas side temperature sensors 205 and 305, the calculation unit of the superheat detection device. (Not shown), the refrigerant superheat degree in each of the indoor units 200 and 300 can be obtained.
  • the calculation units of the temperature difference detection device and the superheat degree detection device are provided in a control device (not shown), and the calculation unit of the temperature difference detection device and the calculation unit of the superheat degree detection device are shared by one calculation unit. You may make it do. That is, the temperature difference detection device includes the intake air temperature sensors 206 and 306, the blown air temperature sensors 207 and 307, and the calculation unit, as in the first embodiment, and the superheat detection device is on the refrigerant liquid side. It comprises temperature sensors 204 and 304, the refrigerant gas side temperature sensors 205 and 305, and the calculation unit.
  • the outdoor unit 100 and the indoor units 200 and 300 are connected by a liquid pipe 121 and a gas pipe 122 to constitute a refrigeration cycle, and this embodiment is the same as the first embodiment as a refrigerant circulating in the refrigeration cycle.
  • a mixed refrigerant containing R32 or R32 in an amount of 70% by mass or more is used.
  • the air conditioner of the second embodiment is also configured as a multi-room type air conditioner in which a plurality of indoor units 200 and 300 are connected to one outdoor unit 100.
  • cooling operation and heating operation in the present Example 2 is the same as the operation
  • the temperature of the refrigerant discharged from the compressor 104 is detected by a discharge temperature sensor 111 provided near the outlet of the compressor 104.
  • the intake air temperature in each indoor unit 200, 300 is detected by the intake air temperature sensors 206, 306, and the blown air temperature is detected by the blown air temperature sensors 207, 307.
  • a difference in the temperature of the intake and outlet air is detected.
  • the temperature of the refrigerant flowing into the indoor heat exchangers 201 and 301 is the refrigerant liquid side temperature sensors 204 and 304
  • the temperature of the refrigerant flowing out of the indoor heat exchangers 201 and 301 is the refrigerant gas side temperature sensor 205.
  • the superheat degree detection device detects the degree of refrigerant superheat in each indoor unit.
  • the cooling capacity of each indoor unit during the cooling operation is determined by the air temperature detected by the temperature difference detection device of each indoor unit according to the refrigerant discharge temperature of the compressor 104 detected by the discharge temperature sensor 111.
  • the indoor expansion valves (indoor expansion mechanisms) 203 and 303 are adjusted and controlled on the basis of either the difference or the refrigerant superheat degree detected by the superheat degree detection device.
  • the cooling capacity is determined as the refrigerant overheating detected by the superheat degree detection device.
  • the cooling capacity is controlled by detecting the temperature difference. It is controlled by adjusting the indoor expansion valves 203 and 303 based on the air temperature difference detected by the apparatus.
  • the cooling capacity in each indoor unit 200, 300 can be estimated.
  • the horizontal axis represents the compressor discharge temperature detected by the discharge temperature sensor 111
  • the vertical axis represents the cooling capacity control by the indoor expansion valves (indoor expansion mechanisms) 203 and 303.
  • the cooling capacity control of each of the indoor units 200 and 300 is performed by the refrigerant superheat degree control as indicated by the straight line A. That is, from the difference between the refrigerant liquid side temperature detected by the refrigerant liquid side temperature sensors 204 and 304 and the refrigerant gas side temperature detected by the refrigerant gas side temperature sensors 205 and 305, the superheat degree detecting device The refrigerant superheat degree in each of the indoor units 200 and 300 is obtained. Based on the degree of superheat of the refrigerant, the opening degree of the indoor expansion valves 203 and 303 is adjusted, whereby the cooling capacity of the indoor units 200 and 300 is controlled.
  • the air temperature difference Switch to control. That is, an air temperature difference is obtained by the temperature difference detection device from the intake air temperature detected by the intake air temperature sensors 206 and 306 and the blown air temperature detected by the blown air temperature sensors 207 and 307. . Based on this air temperature difference, the opening degree of the indoor expansion valves 203 and 303 is adjusted, whereby the cooling capacity of the indoor units 200 and 300 is controlled.
  • the compressor discharge temperature is lowered to a temperature (80 ° C. in this example) that is lower than the set temperature by a predetermined temperature (20 ° C. in this example) that is lower than the set temperature.
  • the control is configured to be switched from the air temperature difference control indicated by the straight line B to the refrigerant superheat degree control indicated by the straight line A.
  • the switching from the refrigerant superheat control indicated by the straight line A to the air temperature difference control indicated by the straight line B results in the compressor discharge temperature being the set temperature (100 ° C. in this example). It is done from.
  • the hysteresis is provided so as to prevent the air temperature difference control and the refrigerant superheat degree control from being frequently switched at the set temperature. Therefore, a more reliable air conditioner can be obtained.
  • the control is performed by the air temperature difference control.
  • the refrigerant can be controlled to include a liquid refrigerant. Therefore, even an air conditioner that uses a refrigerant such as R32 can suppress an abnormal rise in the compressor discharge temperature, so that a highly reliable air conditioner can be obtained.
  • the refrigerant at the outlet of the heat exchanger is controlled to include liquid refrigerant, the refrigerant superheat control cannot be used for the cooling capacity control of each indoor unit, but in this case, each indoor unit is controlled by the air temperature difference control. Therefore, the cooling capacity of each indoor unit of the multi-room air conditioner can be individually controlled.
  • the cooling capacity of each indoor unit is controlled by the refrigerant superheat degree control.
  • this invention is not limited to an above-described Example, Various modifications are included.
  • the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
  • a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
  • Information such as a program for realizing the above control, set temperature, and predetermined temperature is stored in an air conditioner control device, a remote controller, etc., a hard disk, a recording device such as an SSD (Solid State Drive), Alternatively, it can be placed on a recording medium such as an IC card, an SD card, or a DVD.
  • an air conditioner control device a remote controller, etc.
  • a hard disk a recording device such as an SSD (Solid State Drive)
  • SSD Solid State Drive

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
PCT/JP2013/076465 2012-10-15 2013-09-30 空気調和機 WO2014061431A2 (ja)

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EP3150935B1 (en) * 2014-05-30 2019-03-06 Mitsubishi Electric Corporation Air conditioner
US10386795B2 (en) * 2014-10-30 2019-08-20 Vivint, Inc. Methods and apparatus for parameter based learning and adjusting temperature preferences
JP6498538B2 (ja) * 2015-06-11 2019-04-10 鹿島建設株式会社 空調制御装置及び空調制御方法
CN106288215A (zh) * 2016-08-23 2017-01-04 珠海格力电器股份有限公司 空调装置的控制方法
CN108800479B (zh) * 2018-06-12 2020-12-11 广东美的制冷设备有限公司 一拖多空调的控制方法、装置及计算机可读存储介质
CN115289604B (zh) * 2022-08-12 2024-07-23 珠海格力电器股份有限公司 制热过负荷保护方法和装置、空调器

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JPH0784956B2 (ja) 1988-07-11 1995-09-13 ダイキン工業株式会社 空気調和装置の運転制御装置
JP3188989B2 (ja) * 1993-04-06 2001-07-16 株式会社日立製作所 空気調和機
JP3341500B2 (ja) * 1994-11-25 2002-11-05 株式会社日立製作所 冷凍装置およびその運転方法
JP3643162B2 (ja) * 1995-12-27 2005-04-27 東プレ株式会社 空気調和装置
US6244057B1 (en) * 1998-09-08 2001-06-12 Hitachi, Ltd. Air conditioner
DE60037445T2 (de) * 1999-10-18 2008-12-04 Daikin Industries, Ltd. Kältevorrichtung
JP3956589B2 (ja) 1999-10-18 2007-08-08 ダイキン工業株式会社 冷凍装置
JP2002327950A (ja) * 2001-04-27 2002-11-15 Daikin Ind Ltd 空気調和装置
JP2006046692A (ja) * 2004-07-30 2006-02-16 Daikin Ind Ltd ヒートポンプ式空気調和機
JP4730738B2 (ja) * 2005-12-26 2011-07-20 日立アプライアンス株式会社 空気調和機
JP2008064439A (ja) * 2006-09-11 2008-03-21 Daikin Ind Ltd 空気調和装置
DE102006050763B4 (de) * 2006-10-27 2015-02-05 Bayerische Motoren Werke Aktiengesellschaft Fahrzeugklimaanlage mit zwei Verdampfern
JP2008116124A (ja) * 2006-11-06 2008-05-22 Hitachi Appliances Inc 空気調和機
JP4905271B2 (ja) * 2007-06-29 2012-03-28 ダイキン工業株式会社 冷凍装置
JP4968373B2 (ja) * 2010-08-02 2012-07-04 ダイキン工業株式会社 空気調和装置

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WO2014061431A3 (ja) 2014-06-12
JP6000053B2 (ja) 2016-09-28
CN104583684B (zh) 2017-05-24
CN104583684A (zh) 2015-04-29
US10234147B2 (en) 2019-03-19
US20150198341A1 (en) 2015-07-16
JP2014081097A (ja) 2014-05-08
IN2015DN00940A (enrdf_load_stackoverflow) 2015-06-12

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